package com.reggie.filter;


import com.alibaba.fastjson.JSON;
import com.reggie.configuration.BaseContext;
import com.reggie.configuration.R;
import com.reggie.pojo.Employee;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;
import org.springframework.util.DigestUtils;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.time.LocalDateTime;

/**
 * 坚持用户是否登录
 */

@Slf4j
@WebFilter(filterName = "loginCheckFilter",urlPatterns = "/*")
public class LoginCheckFilter implements Filter {
    //路径匹配器，支持通配符
    public static final AntPathMatcher PATH_MATCHER = new AntPathMatcher();

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest)servletRequest;
        HttpServletResponse response = (HttpServletResponse)servletResponse;

        //1.获取本次请求的URI
        String requestURI = request.getRequestURI();
        log.info("拦截到请求：{}",requestURI);

        //定义不需要处理的URI
        String[] uris =  new String[]{
                "/employee/login",
                "/employee/logout",
                "/backend/**",
                "/front/**",
                "/common/**",
                "/user/login" //移动端登录
        };

        //2.判断本次请求是否需要处理
        boolean check = check(uris, requestURI);

        //3.如果不需要处理，直接放行
        if(check){
            log.info("本次请求{} 不需要处理，直接放行",requestURI);
            filterChain.doFilter(request,response);
            return;
        }

        //4.判断登录状态，如果已登录，则放行
        if(request.getSession().getAttribute("employee") != null){
            log.info("用户已登录，用户id为：{}",request.getSession().getAttribute("employee"));
            Long id =(Long) request.getSession().getAttribute("employee");
            BaseContext.setCurrentId(id); //设置线程局部变量（ThreadLocal）
            filterChain.doFilter(request,response);
            return;
        }

        //判断手机端登录状态
        if(request.getSession().getAttribute("user") != null){
            Long userId =(Long) request.getSession().getAttribute("user");
            log.info("用户已登录，用户id为：{}",userId);
            BaseContext.setCurrentId(userId);
            filterChain.doFilter(request,response);
            return;
        }

        //5.如果未登录，则返回未登录结果,通过输出流向客户端页面响应数据
        log.info("用户未登录");
        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
        return;
    }

    /**
     * 匹配不需要处理的路径
     * @param uris
     * @param requestUri
     * @return
     */
    public boolean check(String[] uris,String requestUri){
        for(String uri:uris){
            boolean flag = PATH_MATCHER.match(uri, requestUri);
            if(flag){
                return true;
            }
        }
        return false;
    }

}
